public class Circular {
   Circle bottom;
   double height;
   void setBottom(Circle c) {
      bottom = c;
   }
   void setHeight(double h) {
      height = h;
   }
   double getVolme() {
      if(bottom ==null)
         return -1;
      else
         return bottom.getArea()*height/3.0;
   }
   double getBottomRadius() {
      return bottom.getRadius();
   }
   public void setBottomRadius(double r){
      bottom.setRadius(r);
   }
}
